.
IBM13T16644NPA
16M x 64 PC100 SDRAM SO DIMM
Features
• Programmable Operation:
• 144 Pin JEDEC Standard, 8 Byte Small Outline
Dual-In-line Memory Module
- CAS Latency: 2, 3
- Burst Type: Sequential or Interleave
- Burst Length: 1, 2, 4, 8, Full-Page (Full-
Page supports Sequential burst only)
- Operation: Burst Read and Write or Multiple
Burst Read with Single Write
• 16Mx64 Synchronous DRAM SO DIMM
• Performance PC100
-360
3
Units
CAS Latency
fCK
tCK
tAC
Clock Frequency
Clock Cycle
100
MHz
ns
• Auto Refresh (CBR) and Self Refresh
• Automatic and controlled Precharge Commands
• Suspend Mode and Power Down Mode
• 12/9/2 Addressing (Row/Column/Bank)
• 4096 refresh cycles distributed across 64ms
• Serial Presence Detect
10
6
Clock Access Time
ns
• Inputs and outputs are LVTTL (3.3V) compatible
• 10 Ohm Resistors on DQ’s
• Single 3.3V ± 0.3V Power Supply
• Single Pulsed RAS interface
• SDRAMs have 4 internal banks
• Card size: 2.66" x 1.25" x 0.149"
• Gold contacts
• Fully Synchronous to positive Clock Edge
• Data Mask for Byte Read/Write control
• SDRAMS in TSOP Type II Package
Description
IBM13T16644NPA is a 144-pin Synchronous DRAM
Small Outline Dual In-line Memory Module (SO
DIMM) which is organized as a 16Mx64 high-speed
memory array. The SO DIMM uses eight 8Mx16
SDRAMs in 400mil TSOP II packages. The SO -
DIMM achieves high speed data transfer rates of up
to 100MHz by employing a prefetch/pipeline hybrid
architecture that supports the JEDEC 1N rule while
allowing very low burst power.
RAS, CAS, WE, S0, S1, DQMB, and CKE0, CKE1,
signals. A command decoder initiates the necessary
timings for each operation. A 12 bit address bus
accepts address information in a row/column multi-
plexing arrangement.
Prior to any access operation, the CAS latency,
burst type, burst length, and burst operation type
must be programmed into the SO DIMM by address
inputs A0-A9 during the Mode Register Set cycle.
The SO DIMM is intended to comply with all JEDEC
and INTEL PC100 rev 1.0 standards set for 144 pin
SDRAM SO DIMMs.
The SO DIMM uses serial presence detects imple-
mented via a serial EEPROM using the two pin IIC
protocol. The first 128 bytes of serial PD data are
used by the DIMM manufacturer. The last 128 bytes
are available to the customer.
All control, address, and data input/output circuits
are synchronized with the positive edge of the exter-
nally supplied clock inputs.
All IBM 144-pin SO DIMMs provide a high perfor-
mance, flexible 8-byte interface in a 2.66" long
space-saving footprint.
All inputs are sampled at the positive edge of each
externally supplied clock (CK0, CK1). Internal oper-
ating modes are defined by combinations of the
Card Outline
(
Front)
1
2
143
144
59
60
61
62
(Back)
©IBM Corporation. All rights reserved.
09K1470.E92279
2/01
Use is further subject to the provisions at the end of this document.
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